819855103 has 2 divisors, whose sum is σ = 819855104. Its totient is φ = 819855102.

The previous prime is 819855089. The next prime is 819855137. The reversal of 819855103 is 301558918.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 819855103 - 2²¹ = 817757951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (819855193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409927551 + 409927552.

It is an arithmetic number, because the mean of its divisors is an integer number (409927552).

Almost surely, 2^819855103 is an apocalyptic number.

819855103 is a deficient number, since it is larger than the sum of its proper divisors (1).

819855103 is an equidigital number, since it uses as much as digits as its factorization.

819855103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43200, while the sum is 40.

The square root of 819855103 is about 28633.1120034131. The cubic root of 819855103 is about 935.9350281045.

The spelling of 819855103 in words is "eight hundred nineteen million, eight hundred fifty-five thousand, one hundred three".